_36^92Kr+_56^141Ba+3_0^1n In this example, a neutron reacts with uranium-235 … B. Fusion occurs in a nuclear power plant. In the Sun the process occurs in a controled manner. It takes place only at extremely high temperatures. This photo was taken by the Solar and Heliospheric Observatory (SOHO), a joint project of the ESA (European Space Agency) and NASA. Fusion occurs when two atoms slam together to form a heavier atom, like when two hydrogen atoms fuse to form one helium atom. What are the main constituents of the jovian planets? why will the sun eventually change its state from yellow dwarf to other form why is the temperature of the sun gradually decreasing no spams plzs Ask for details ; Follow Report 20.04.2018 if a star begins its evolution with 10 times the mass of the sun, but ends up with 2 times the mass of the sun, what type of object does … In cases where the interacting nuclei belong to elements with low atomic numbers (e.g., hydrogen [atomic number 1] or its isotopes deuterium and tritium), substantial amounts of energy are released. For example, when hydrogen nuclei collide, they can fuse into heavier helium nuclei and release tremendous amounts of energy in the process. Nuclear Fusion reactions power the Sun and other stars. First it can happen spontaneously as a form of radioactive decay in very heavy elements like Thorium and Uranium, but this is rare. In its core 2. a. Hydrogen and helium 3. It's made of PET, EVA and monocrystalline silicon, and it's anti-reflective and high transparency. DOKIO Monocrystalline Foldable Solar Panel, Renogy 300 Watt Monocrystalline Solar Panel, Renogy 100 Watts 12 Volts Monocrystalline Solar Starter Kit, This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses. The power generator in the Sun is in its center, buried deeply within it. Where does nuclear fusion occur in the sun? Free e-mail watchdog. Anyone new to solar panels should start with a good kit, like this one by Renology. Modern nuclear power plants produce power from the energy produced during nuclear fission, where heavy and unstable atoms are split open. Typically, a neutron will react with an atom of Uranium-235 to produce two smaller atoms, for example Rubidium and Caesium, plus three neutrons. The answer is B. Fusion occurs inside the sun. a. Hydrogen and helium 3. It creates light and heart that sustain life on earth. Nuclear fusion of hydrogen to form helium occurs naturally in the sun and other stars. Why does nuclear fusion only occur in the core of the Sun? At the temperatures and densities in stellar cores the rates of fusion reactions are notoriously slow. An example would be in nuclear power plants, where uranium is decayed into other substances. You may be able to find more information about this and similar content at piano.io, This Solar Cell Just Set an Efficiency Record, Tiny Nuclear Reactors Produce Huge Clean Hydrogen, U.S. Scientists Plan Nuclear Fusion Power Plant, World's First Nuclear Fusion Power Plant Is Coming, How Salt Caves Will Store Huge Amounts of Hydrogen, History's Forgotten Machines: Heron's Aeolipile, Truck Crashes Into Nuclear Weapons Transporter. Fusion is the main nuclear process that occurs in the Sun and other stars. Where does nuclear fusion occur in the Sun? The energies released in this fleeting moment dwarf that of the star's entire lifetime. This fusion cycle is known as the proton-proton chain, and it’s the reaction that happens in stars with the mass of our Sun. C. When wood burns, fusion occurs. 1. This is the same process that powers the sun and creates huge amounts of … experimental devices Nuclear fusion reaction requires high temperatures and high densities. The very high temperature and pressure in the sun's core allows the nuclear reaction fusion to occur. Nuclear fusion is a process where two or more nuclei combine to form an element with a higher atomic number (more protons in the nucleus). B. Fusion occurs in a nuclear power plant. Does the nuclear fusion in the Sun occur only near the center. 1 decade ago. Why does fusion occur in the Suns core Nuclear fusion a reaction where heavier from ASTRONOMY 4 at University of California, Los Angeles Popular Mechanics participates in various affiliate marketing programs, which means we may get paid commissions on editorially chosen products purchased through our links to retailer sites. Relevance. It is the opposite reaction of fission, where heavy isotopes are split apart. On Earth, nuclear fusion was first reached in the explosion of the Stars a few times bigger than our sun explode when they run out of energy at the end of their lifetimes. What we see as light and feel as warmth coming from the Sun is the result of this fusion … This occurs in the central part of the sun. Because of how neutrino detection technology developed, the way we discovered neutrinos wasn’t in order of abundance, for example. A. Fusion occurs inside the sun. Nuclear forces are small-distance forces and have t… Nuclear fusion occurs in the Sun’s core, which, not coincidentally, is also the hottest part of its whole constitution. NASA has unlocked nuclear fusion on a tiny scale, with a phenomenon called lattice confinement fusion that takes place in the narrow channels between atoms. The CNO-cycle mentioned above is, in contrast, one of the most difficult neutrinos to observe. Nuclear fusion begins in the suns core. Fusion is a process in which two nuclei combine to form a nucleus of larger mass number. Nuclear Fission: The word fission means division or splitting. where does nuclear fusion in the sun occur? Once iron is formed, nuclear fusion in the star’s core comes to a stop. Scientists are searching for ways to create controlled nuclear fusion reactions in order to produce safe nuclear power . Fusion is the reverse process of nuclear fission. Sun: According to NASA, the Sun can be divided into several layers. A Sun-mass star does not fuse helium. When Nature Strikes: Tsunami Classroom Activity. Fusion occurs when two atoms slam together to form a heavier atom, like when two hydrogen atoms fuse to form one helium atom. It’s most easily achieved on Earth by combining two isotopes of hydrogen: … With their new noise-filtering tool, they have the first sound measurement of the sun’s combination of CNO-cycle as well as pp-chain reactions. Prominences: What is a burst of light on the photosphere that lasts less than an hour with temps of 12,000 C and releases much energy into space: In the core, pressures and temperatures are high enough to force fusion, that is, nuclear reactions whereby some nuclei merge to make others. This process occurs in the sun’s core or interior, where temperature and pressure are extremely high. It's also easy to use and compact in size, making it easy to store when not needed. 1 Answer Don Mac Feb 18, 2016 In the core where it is the hottest. 3 Answers. And detecting them is procedurally hard, Universe Today explains: To solve this problem, scientists made a neutrino-noise coin sorter that shakes out the big, heavy quarters, so to speak, leaving behind the finer and less heavy dimes. It creates the light and heat that sustain life on Earth. Because nuclear reaction rates depend on density as well as temperature and most fusion … 1 decade ago. Why does fusion occur in the Suns core Nuclear fusion a reaction where heavier from ASTRONOMY 4 at University of California, Los Angeles Explanation of Solution. Positron formation does occur as a result of solar nuclear fusion, but as there are lots, and lots, of electrons around, mutual annihilation removes them. (In a colloquial sense, the furthest extension of the weak interaction of neutrinos is something like dark matter, which scientists believe is mingling around us all the time without disturbing our matter.). In the core: Name the solar storm that originates in the chormophere and sends out loops or arches of gas. The sun and stars do this by gravity. When we say that jovian planets contain significant amounts of hydrogen compounds, we mean all the following chemicals except _____. In a bomb it happens all at once in a big chain-reaction explosion. Over billions of years, the gravitational forces at play in the Universe … The leftover mass becomes energy. They're capable of withstanding high winds and snow loads, they're anti-reflective, and extremely versatile. For example, at solar core temperature (T ≈ 15 MK) and density (160 g/cm ), the energy release rate is only 276 μW/cm —about a quarter of the volumetric rate at which a resting human body generates heat. See How Tiny Nuclear Reactors Are Changing Energy. As a side note, the Sun is a very calm reactor by Earthling's standards. Gear-obsessed editors choose every product we review. Nuclear fusion doesn't occur naturally on Earth, but low levels of radioactive decay from terrestrial rocks can trigger events in a neutrino detector that are similar to CNO neutrino detections.” Where does nuclear fusion occur in the Sun? Where does nuclear fusion occur in the Sun? This one is easy to take on-the-go with you if you're camping, and easy to store if you're using it at home in case of a power outage. That means the sun is doubling its output by harmonizing on different wavelengths. If you want to really go all out, you can't go wrong with Renology's 10-piece, 300-watt solar panels. (1 point) A. The first neutrinos we were able to find represent an unusual chemical reaction at much higher energy than many other reactions. C. Fusion occurs inside the earth. The fusion of two protons during the nuclear fusion process creates a positron as one of the protons changes into a neutron and a neutrino, forming deuterium, an isotope of … You may be able to find the same content in another format, or you may be able to find more information, at their web site. In its core 2. after university i did a shoret; After a number of failed attemps to reach an out-of-court settlement; Made to replicate the natural reactions that occur in the sun using hydrogen and deuterium gases as fuels, the HL-2M Tokamak reactor is China's largest and most advanced nuclear fusion experimental research device. Radioactive decay of unstable isotopes also occurs. Science . Nuclear fusion occurs when two or more atoms join or fuse together to form a large or heavy atom. It takes place only at extremely high temperatures. What are the main constituents of the jovian planets? If it weren’t for the quantum nature of the Universe, however, nuclear fusion wouldn’t occur in the Sun at all, and Earth would simply be a cold, lifeless rock floating in the abyss of space. Nuclear Fusion only occurs naturally on the sun or other high energy stars. Nuclear fusion is an attempt to replicate the processes of the Sun on Earth. a. This is the same process that powers the sun and creates huge amounts of energy—several times greater than fission. It really is nuclear fusion that powers the stars, but not the fusion of hydrogen into helium. confined, long enough for fusion to occur. A huge amount of mass is above you, squeezing down on you from all sides. The process releases energy because the total mass of the resulting single nucleus is less than the mass of the two original nuclei. These are ideal for residential or commercial rooftops, but they're compatible with a ground-mount as well. Which observation most likely indicates that a physical change has taken place? 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Uranium fission powers Sunlight According to NASA, the way we discovered neutrinos wasn ’ in! Power from the energy produced during nuclear fission, where energy is produced the released... Once iron is formed, nuclear fusion reactions at their cores from 50 % in 3 hours withstanding. Be in nuclear power plants, where energy is needed to overcome force... Is 34 minutes and may be ready in about 10-20 years above,. Center to about 1.391 X 10 5 km for ways to create small-scale fusion power ourselves, here Earth! The huge gravity of the sun is a process in which two nuclei combine to form single! Is, in contrast, one of the jovian planets contain significant amounts of energy—several times greater than fission reasons... It can happen spontaneously as a form of light and extremely versatile much... Reactions is difficult commission if you buy from a link enter neutrinos, which can be seen with some of... 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where does nuclear fusion occur in the sun

Prominences: What is a burst of light on the photosphere that lasts less than an hour with temps of 12,000 C and releases much energy into space: The total radius of the Sun is 6.955×10 5 km (about 109 times radius of Earth). Nuclear Fusion . Fusion requires a huge, huge amount of energy to get started, and the center of a star is where the gravitational energy is the greatest. Where does nuclear fusion occur in the Sun? Nuclear Fusion It is a nuclear process, where energy is produced by smashing together light atoms. The temperature at the sun’s core is approximately 15 million degrees Celsius. Explanation: Scientists are trying to develop fusion reactors here on Earth, but this is proving to be a very difficult challenge. In a fusion reaction, two light nuclei merge to form a single heavier nucleus. Nuclear fusion doesn't occur naturally on Earth, but low levels of radioactive decay from terrestrial rocks can trigger events in a neutrino detector that are similar to CNO neutrino detections.” For a fusion reaction to occur it is necessary to bring the nuclei so close together that nuclear forces become On earth, we can use fusion in the laboratories or as an aftermath of an atomic explosion (this is how we found the last 15 elements on the periodic table). You'll get everything you need in one, including an 100W solar panel, 30A PWM negative ground charge controller, MC4 connectors, a 8Ft 10 AWG tray cable, and mounting Z brackets for an RV or boat. It heats Magma, which can be used to heat homes or generate electricity D. When wood burns, fusion occurs. Not only is there the strongest … It is a nuclear process, where energy is produced by smashing together light atoms. This is because of their physical properties and the fact that they respond to the weak, rather than strong, force of physics in our universe. Fusion is the reverse process of nuclear fission. Where does nuclear fusion occur in the Sun? During most of the sun’s life, energy comes from the fusion of hydrogen nuclei. The sun fuses hydrogen at a constant rate. For these reasons fusion most easily occurs in a high density, high Every second, 600 million tons of hydrogen are being converted into helium. Fusion is the process by which the sun and other stars generate light and heat. core. The CNO cycle (for carbon–nitrogen–oxygen; sometimes called Bethe–Weizsäcker cycle after Bethe and Weizsäcker) is one of the two known sets of fusion reactions by which stars convert hydrogen to helium, the other being the proton–proton chain reaction (p-p cycle), which is more efficient at the Sun's core temperature. The energy produced is light and heat. And, the scientists say, this could pave the way to a more sophisticated understanding of how small stars and large stars share common reactions in different quantities as size and circumstances change. Nuclear fusion occurs in the center or core of the sun. Fusion is the process by which the sun and other stars generate light and heat. The energy produced is electricity and light. heat and pressure, electrons are stripped from the protons by the sun's intense heat What conditions in this part of the sun's interior cause nuclear fusion to happen? It is called "the core", with a radius close to one fourth of that of the star (see the figure above). The core of the Sun extends from the very center of the out to about 0.2 solar radii. Going out with a Bang. However, a working fusion reactor may be ready in about 10-20 years. If you live somewhere with low light, you might be worried that solar panels aren't for you, but these actually perform excellently in low light conditions. In cases where the interacting nuclei belong to elements with low atomic numbers (e.g., hydrogen [atomic number 1] or its isotopes deuterium and tritium), substantial amounts of energy are released. Where does nuclear fusion occur in the sun? Fusion reactions power the Sun Fusion releases energy. The energy produced is light and heat. It takes place only at extremely high temperatures. A portion of the digitized sky survey with the nearest star to our Sun… Since hydrogen is the most basic element, the forces of heat and gravity fuse atoms of hydrogen together to create helium, releasing electrons and huge amounts of energy. It takes place only at extremely high temperatures. If you aren't really sure where to start, this solar panel is a failsafe option. Not nuclear, it takes an extremely hight temperature for Fusion to occur with in the sun or any other star. Fusion releases energy. Which of the following layers of the Sun can be seen with some type of telescope? Select all that apply. Thus, reproduction of stellar core conditions in a lab for nuclear fusion power production is completely impractical. Nuclear Fusion reactions power the Sun and other stars. B. Fusion occurs inside the sun. A reaction occurs. A lot of places. The Sun shines because it is able to convert energy from gravity into light. temperature environment. For a fusion reaction to occur it is necessary to bring the nuclei so close together that nuclear forces become Answer this question. It can fully charge a 50Ah Battery from 50% in 3 hours. Answer Save. The pressure at the core of any star is immensely high and that is where the nuclear fusion reaction occurs. and how does it travel through the rest of the solar system. asmidsk@verizon.net. Nuclear fission can happen in a nuclear reaction. The energy produced is light and heat. In which layer of the Sun does nuclear fusion occur? Questions; science. We may earn commission if you buy from a link. 2 Answers. The energy from the Sun - both heat and light energy - originates from a nuclear fusion process that is occurring inside the core of the Sun.The specific type of fusion that occurs inside of the Sun is known as proton-proton fusion.. Fission occurs from several different causes. An example equation would be as follows ""_0^1n+_92^235U->_36^92Kr+_56^141Ba+3_0^1n In this example, a neutron reacts with uranium-235 … B. Fusion occurs in a nuclear power plant. In the Sun the process occurs in a controled manner. It takes place only at extremely high temperatures. This photo was taken by the Solar and Heliospheric Observatory (SOHO), a joint project of the ESA (European Space Agency) and NASA. Fusion occurs when two atoms slam together to form a heavier atom, like when two hydrogen atoms fuse to form one helium atom. What are the main constituents of the jovian planets? why will the sun eventually change its state from yellow dwarf to other form why is the temperature of the sun gradually decreasing no spams plzs Ask for details ; Follow Report 20.04.2018 if a star begins its evolution with 10 times the mass of the sun, but ends up with 2 times the mass of the sun, what type of object does … In cases where the interacting nuclei belong to elements with low atomic numbers (e.g., hydrogen [atomic number 1] or its isotopes deuterium and tritium), substantial amounts of energy are released. For example, when hydrogen nuclei collide, they can fuse into heavier helium nuclei and release tremendous amounts of energy in the process. Nuclear Fusion reactions power the Sun and other stars. First it can happen spontaneously as a form of radioactive decay in very heavy elements like Thorium and Uranium, but this is rare. In its core 2. a. Hydrogen and helium 3. It's made of PET, EVA and monocrystalline silicon, and it's anti-reflective and high transparency. DOKIO Monocrystalline Foldable Solar Panel, Renogy 300 Watt Monocrystalline Solar Panel, Renogy 100 Watts 12 Volts Monocrystalline Solar Starter Kit, This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses. The power generator in the Sun is in its center, buried deeply within it. Where does nuclear fusion occur in the sun? Free e-mail watchdog. Anyone new to solar panels should start with a good kit, like this one by Renology. Modern nuclear power plants produce power from the energy produced during nuclear fission, where heavy and unstable atoms are split open. Typically, a neutron will react with an atom of Uranium-235 to produce two smaller atoms, for example Rubidium and Caesium, plus three neutrons. The answer is B. Fusion occurs inside the sun. a. Hydrogen and helium 3. It creates light and heart that sustain life on earth. Nuclear fusion of hydrogen to form helium occurs naturally in the sun and other stars. Why does nuclear fusion only occur in the core of the Sun? At the temperatures and densities in stellar cores the rates of fusion reactions are notoriously slow. An example would be in nuclear power plants, where uranium is decayed into other substances. You may be able to find more information about this and similar content at piano.io, This Solar Cell Just Set an Efficiency Record, Tiny Nuclear Reactors Produce Huge Clean Hydrogen, U.S. Scientists Plan Nuclear Fusion Power Plant, World's First Nuclear Fusion Power Plant Is Coming, How Salt Caves Will Store Huge Amounts of Hydrogen, History's Forgotten Machines: Heron's Aeolipile, Truck Crashes Into Nuclear Weapons Transporter. Fusion is the main nuclear process that occurs in the Sun and other stars. Where does nuclear fusion occur in the Sun? The energies released in this fleeting moment dwarf that of the star's entire lifetime. This fusion cycle is known as the proton-proton chain, and it’s the reaction that happens in stars with the mass of our Sun. C. When wood burns, fusion occurs. 1. This is the same process that powers the sun and creates huge amounts of … experimental devices Nuclear fusion reaction requires high temperatures and high densities. The very high temperature and pressure in the sun's core allows the nuclear reaction fusion to occur. Nuclear fusion is a process where two or more nuclei combine to form an element with a higher atomic number (more protons in the nucleus). B. Fusion occurs in a nuclear power plant. Does the nuclear fusion in the Sun occur only near the center. 1 decade ago. Why does fusion occur in the Suns core Nuclear fusion a reaction where heavier from ASTRONOMY 4 at University of California, Los Angeles Popular Mechanics participates in various affiliate marketing programs, which means we may get paid commissions on editorially chosen products purchased through our links to retailer sites. Relevance. It is the opposite reaction of fission, where heavy isotopes are split apart. On Earth, nuclear fusion was first reached in the explosion of the Stars a few times bigger than our sun explode when they run out of energy at the end of their lifetimes. What we see as light and feel as warmth coming from the Sun is the result of this fusion … This occurs in the central part of the sun. Because of how neutrino detection technology developed, the way we discovered neutrinos wasn’t in order of abundance, for example. A. Fusion occurs inside the sun. Nuclear forces are small-distance forces and have t… Nuclear fusion occurs in the Sun’s core, which, not coincidentally, is also the hottest part of its whole constitution. NASA has unlocked nuclear fusion on a tiny scale, with a phenomenon called lattice confinement fusion that takes place in the narrow channels between atoms. The CNO-cycle mentioned above is, in contrast, one of the most difficult neutrinos to observe. Nuclear fusion begins in the suns core. Fusion is a process in which two nuclei combine to form a nucleus of larger mass number. Nuclear Fission: The word fission means division or splitting. where does nuclear fusion in the sun occur? Once iron is formed, nuclear fusion in the star’s core comes to a stop. Scientists are searching for ways to create controlled nuclear fusion reactions in order to produce safe nuclear power . Fusion is the reverse process of nuclear fission. Sun: According to NASA, the Sun can be divided into several layers. A Sun-mass star does not fuse helium. When Nature Strikes: Tsunami Classroom Activity. Fusion occurs when two atoms slam together to form a heavier atom, like when two hydrogen atoms fuse to form one helium atom. It’s most easily achieved on Earth by combining two isotopes of hydrogen: … With their new noise-filtering tool, they have the first sound measurement of the sun’s combination of CNO-cycle as well as pp-chain reactions. Prominences: What is a burst of light on the photosphere that lasts less than an hour with temps of 12,000 C and releases much energy into space: In the core, pressures and temperatures are high enough to force fusion, that is, nuclear reactions whereby some nuclei merge to make others. This process occurs in the sun’s core or interior, where temperature and pressure are extremely high. It's also easy to use and compact in size, making it easy to store when not needed. 1 Answer Don Mac Feb 18, 2016 In the core where it is the hottest. 3 Answers. And detecting them is procedurally hard, Universe Today explains: To solve this problem, scientists made a neutrino-noise coin sorter that shakes out the big, heavy quarters, so to speak, leaving behind the finer and less heavy dimes. It creates the light and heat that sustain life on Earth. Because nuclear reaction rates depend on density as well as temperature and most fusion … 1 decade ago. Why does fusion occur in the Suns core Nuclear fusion a reaction where heavier from ASTRONOMY 4 at University of California, Los Angeles Explanation of Solution. Positron formation does occur as a result of solar nuclear fusion, but as there are lots, and lots, of electrons around, mutual annihilation removes them. (In a colloquial sense, the furthest extension of the weak interaction of neutrinos is something like dark matter, which scientists believe is mingling around us all the time without disturbing our matter.). In the core: Name the solar storm that originates in the chormophere and sends out loops or arches of gas. The sun and stars do this by gravity. When we say that jovian planets contain significant amounts of hydrogen compounds, we mean all the following chemicals except _____. In a bomb it happens all at once in a big chain-reaction explosion. Over billions of years, the gravitational forces at play in the Universe … The leftover mass becomes energy. They're capable of withstanding high winds and snow loads, they're anti-reflective, and extremely versatile. For example, at solar core temperature (T ≈ 15 MK) and density (160 g/cm ), the energy release rate is only 276 μW/cm —about a quarter of the volumetric rate at which a resting human body generates heat. See How Tiny Nuclear Reactors Are Changing Energy. As a side note, the Sun is a very calm reactor by Earthling's standards. Gear-obsessed editors choose every product we review. Nuclear fusion doesn't occur naturally on Earth, but low levels of radioactive decay from terrestrial rocks can trigger events in a neutrino detector that are similar to CNO neutrino detections.” Where does nuclear fusion occur in the Sun? Where does nuclear fusion occur in the Sun? This one is easy to take on-the-go with you if you're camping, and easy to store if you're using it at home in case of a power outage. That means the sun is doubling its output by harmonizing on different wavelengths. If you want to really go all out, you can't go wrong with Renology's 10-piece, 300-watt solar panels. (1 point) A. The first neutrinos we were able to find represent an unusual chemical reaction at much higher energy than many other reactions. C. Fusion occurs inside the earth. The fusion of two protons during the nuclear fusion process creates a positron as one of the protons changes into a neutron and a neutrino, forming deuterium, an isotope of … You may be able to find the same content in another format, or you may be able to find more information, at their web site. In its core 2. after university i did a shoret; After a number of failed attemps to reach an out-of-court settlement; Made to replicate the natural reactions that occur in the sun using hydrogen and deuterium gases as fuels, the HL-2M Tokamak reactor is China's largest and most advanced nuclear fusion experimental research device. Radioactive decay of unstable isotopes also occurs. Science . Nuclear fusion occurs when two or more atoms join or fuse together to form a large or heavy atom. It takes place only at extremely high temperatures. What are the main constituents of the jovian planets? If it weren’t for the quantum nature of the Universe, however, nuclear fusion wouldn’t occur in the Sun at all, and Earth would simply be a cold, lifeless rock floating in the abyss of space. Nuclear Fusion only occurs naturally on the sun or other high energy stars. Nuclear fusion is an attempt to replicate the processes of the Sun on Earth. a. This is the same process that powers the sun and creates huge amounts of energy—several times greater than fission. It really is nuclear fusion that powers the stars, but not the fusion of hydrogen into helium. confined, long enough for fusion to occur. A huge amount of mass is above you, squeezing down on you from all sides. The process releases energy because the total mass of the resulting single nucleus is less than the mass of the two original nuclei. These are ideal for residential or commercial rooftops, but they're compatible with a ground-mount as well. Which observation most likely indicates that a physical change has taken place? 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